Good morning help me pls !!!

In the derivation of rrkm theory, a factor of 1/2 is introduced when equalizing the rates of formation and decomposition of activated complex as keal-hr) = ko this is clearly against the assumption of transition state theory that states all the activated complex in the transition state iss going to the product. find the reason why this factor is introduced here.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

The particles that are found in the nucleus of an atom are